Fingerprints
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Principles of Fingerprints
First Principle: A fingerprint is
an individual characteristic;
no two fingers have yet been
found to posses identical
ridge characteristics.
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Principles of Fingerprints
Second Principle: A fingerprint
will remain unchanged during
an individual's lifetime.
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John Dillinger
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Principles of Fingerprints
Third Principle: Fingerprints
have general ridge patterns
that permit them to be
systematically classified.
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Three Main Types of Prints
Loops
Whorls
Arches
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Deltas & Cores
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Loops
 A loop
must have one or more
ridges that enter from one side
of the print, re-curve, and exit
from the same side
 One Delta & One Core
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Whorls
One
or more cores
At least two deltas
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Arches
 An
arch is formed by ridges
entering from one side of the
print, rising slightly and
exiting on the opposite side.
 No Deltas & No Cores
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